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Effect of the Fuel Stratification on the Operating Range for a DME HCCI Engine based on Numerical Analysis  

Kwon, O-Seok (Grad. School of Mechanical & Automotive Engineering, Ulsan Univ.)
Jeong, Dong-Won (Grad. School of Mechanical & Automotive Engineering, Ulsan Univ.)
Back, Young-Soon (KOGAS)
Lim, Ock-Taeck (School of Mechanical & Automotive Engineering, Ulsan Univ.)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.20, no.3, 2009 , pp. 256-263 More about this Journal
Abstract
The operating range of HCCI engine is narrow due to excessive rate of pressure rise on high load. The fuel stratification is proposed to solve the problem. The purpose of this study is to gain a better understanding of the effects of fuel stratification on reducing the pressure-rise rate at high load in HCCI combustion and to investigate that the operating range is expanded for fuel stratification in the preceding condition of initial temperature and equivalence ratios. The engine is fueled with Di-Methyl Ether (DME) which has unique 2-stage heat release. The computations were conducted using SENKIN application of the CHEMKINll kinetics rate code. Calculation result shows that proper fuel stratification prolongs combustion duration and reduce pressure rise rate.
Keywords
HCCI; Fuel stratification; Pressure rise rate; DME; IEMP; Ringing intensity;
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